The iOS 7.0.4 only includes some bug fixes and improvements just like other predecessor updates to iOS 7, which was a major release to iOS. So, if you are the user of iOS 7.0.3 then its recommended for you to get iOS 7.0.4 upgrade on your device through links below.

Users who have jailbroken devices must not upgrade to iOS 7.0.4, until it becomes confirm that the iOS 7.0.4 update is safe for jailbreak community.